I have witness the weather changing during my 70 years of life on the planet, and from my observations the climate is definitely changing. The summers are getting wetter and the winters are getting warmer. As a youth we would get several falls of snow, here on the Fife coast, that lay for a week or two at a time. Now the one or two falls per winter are gone by lunch time.
Whether it is man made change or natural, I cannot voice an educated opinion, but it seems rather quick compared to other changes in climate over the past 1,000 years or so.
So, personally, I believe man is changing the Earth's climate, and not for the better.